Water Data module · GRI 303
Water balance and intensity
Water accounting in Slate is volumetric: what came in, what was used, what was stored and reused, and whether those add up. It produces no emissions.
On this page you'll learn
- The balance formula and its three statuses
- Derived consumption under GRI 303-5
- Reuse rate and intensity
- Standard
- GRI 303, ISO 14046
- Units
- m³ (litres and gallons converted)
- Tolerance
- ±5% of intake by default, set per analysis
- Emissions
- None
The balance
Opening storage is the first inventory entry for each storage unit; closing storage is the last.
Derived consumption
GRI 303-5 defines consumption as withdrawal minus discharge, adjusted for storage. When you record discharge, Slate compares your entered consumption with this derived figure, which catches an inconsistency the storage balance alone can't see.
Status
| Status | When |
|---|---|
| Balanced | The difference is within tolerance, and (if discharge is recorded) entered consumption agrees with derived consumption within tolerance |
| Review required | Either check is outside tolerance |
| Incomplete | No intake and no consumption recorded |
- Available: 10,000 + 500 opening + 800 reuse
- 11,300 m³
- Less consumption 10,200 and closing storage 600
- 500 m³
- Difference ÷ intake
- 5.0%
- Status
- Balanced (at the limit)
The calculation never fails outright. If something goes wrong it saves an incomplete balance and logs the error.
Reuse rate and intensity
Intensity divides consumption by a production or activity denominator, by category. Each analysis can be flagged as in a water-stressed area, which GRI 303 and CDP Water Security ask to disclose separately; the flag is set by you.
Note
A site with its own wastewater treatment plant does emit Scope 1 methane and N₂O. Slate doesn't model that yet, because it needs treatment type and population served rather than a factor.